CN104735755B - A kind of method and system of the business processing of wireless body area network - Google Patents
A kind of method and system of the business processing of wireless body area network Download PDFInfo
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Abstract
This application discloses a kind of method and system of the business processing of wireless body area network (WBAN), all the sensors node and central administration node of WBAN are carried out binary tree networking, central administration node is the vertex of network；It include: the time slot allocation that sensor node is carried out by network distribution；When urgency traffic occurs, the sensor node broadcasts wake-up signal of urgency traffic occurs, triggering all the sensors node enters emergency communication state, and the sensor node of normal communication state abandons current time slots；The sensor node of urgency traffic and its directly under upper layer father node, successively seizing current time slots from low to high by network layer to urgency traffic complete time slot carry out urgency traffic processing.Time slot allocation is carried out according to binary tree network distribution to WBAN node through the invention, realization triggers all nodes by wake-up signal and enters emergency communication state；Occur urgency traffic node and its directly under father node seize current time slots start to urgency traffic complete when time slot carry out urgency traffic processing.
Description
Technical Field
The present invention relates to the field of wireless body area networks, and in particular, to a method and system for service processing in a wireless body area network.
Background
In recent years, due to the dramatic increase in the world population and the increase in the average human life, the ever-rising demand for medical care has created enormous challenges for the application and development of medical care technologies. In this situation, many technologies for increasing the level of medical security are emerging, and a Wireless Body Area Network (WBAN) is one of them. The WBAN is a network consisting of a plurality of sensor nodes attached to the surface of a human body or implanted inside the human body, and a central management node. And the sensor node is used for acquiring the vital sign information of the human body. And the central management node is used for processing the acquired medical data information and then sending the medical data information to a remote medical center through an external communication transmission network so as to check and analyze the health condition and the like. The WBAN can collect medical data information in real time, greatly reduces the work of medical workers and reduces the medical cost.
The current WBAN networks face two major problems. Firstly, it is the first problem faced by WBAN networks to extend the working time of nodes while ensuring the monitoring quality. Because the sensor nodes are independently attached to the human body for data acquisition, the volume of the sensor nodes limits the self electric energy storage during application design. Therefore, the WBAN network is required to ensure that the data information collection and processing process consumes as low energy as possible to realize the long-time data collection of the sensor nodes. In addition, the transmission of emergency traffic in a WBAN is another major issue for WBAN applications. When an emergency occurs, for example, the blood oxygen concentration of the human body suddenly drops greatly, the vital sign information related to the life health of the user acquired by the sensor node needs to be processed and transmitted to the remote medical center in time.
In response to the above two problems, related research institutions and scholars propose respective solutions. Latre et al, supra at the fourth international mobile and pervasive computing systems conference (8.2007, pages 479-486), for example, propose to transfer data in a tree-structured WBAN by TDMA and multi-hop. The scheme can be adaptively adjusted according to the traffic condition of the network, and can obtain high throughput for common services, but in emergency services, the problem of large time delay in the data transmission process still exists. In addition, b.otgonchimeg et al, in "journal of wireless communication and networks by the european voice and image signal processing association" (volume one, 2011), proposed a fast transmission scheme for emergency services in WBAN. Some idle windows specially used for transmitting emergency services are inserted into the frame structure, and the number and the positions of the idle windows are set according to historical data of emergency service occurrence conditions or known emergency service occurrence frequency. Although the scheme can provide low-delay service for the emergent emergency service, the problem of time slot resource waste exists when the special windows are additionally inserted into each frame, and particularly, the problem of time slot resource waste is more obvious under the condition that the emergency service occurrence frequency is very small. In addition, since emergency services are bursty and sparse, there is also a problem that the number of windows obtained based on historical data does not meet the actual demand.
In summary, the conventional WBAN cannot implement reasonable design of network delay and timeslot resources when meeting the service processing under the low power consumption condition, thereby affecting the service processing of the WBAN network.
Disclosure of Invention
In order to solve the technical problem, the invention discloses a method and a system for processing services of a wireless body area network. The method can monitor the emergency service through low energy consumption during normal service, seize the required time slot during the emergency service, and process the emergency service in time.
In order to achieve the purpose of the application, the invention provides a method for processing WBAN service of a wireless body area network, which comprises the steps of carrying out binary tree networking on all sensor nodes and central management nodes of the WBAN, wherein the central management nodes are the vertexes of the network; the method comprises the following steps:
allocating corresponding time slots for each sensor node according to the network distribution of the binary tree networking;
when an emergency service occurs, the sensor node which generates the emergency service broadcasts a wake-up signal to trigger all sensor nodes in the WBAN to enter an emergency communication state, and the sensor node in a normal communication state gives up the current time slot;
and the sensor nodes of the emergency service and the father nodes of all the upper layers of the sensor nodes of the emergency service directly belong to seize the time slots from the beginning of the current time slot to the completion of the emergency service in sequence from low to high according to the network layer, and the emergency service is processed.
Further, after allocating a corresponding time slot to each sensor node, the method further includes:
and during normal service, the sensor node acquiring the current time slot and the parent node of the upper layer directly belonging to the sensor node enter a normal communication state, and other sensor nodes enter a quasi-sleep state.
Further, allocating a corresponding time slot to each sensor node according to the network distribution of the binary tree networking comprises:
according to the network distribution of the binary tree networking of the sensor nodes, carrying out time slot allocation from small to large according to the network number;
allocating unit time slots for bottom sensor nodes; each father node allocates a time slot of which the total number of all nodes under the father node is added with 1.
Further, the quasi-sleep state is: the operating frequency is 1/D of the state in the normal communication state, wherein D is equal to 8 or 16.
Further, the wake-up signal is: and repeating each bit of information in the m-sequence for waking up the normal working state to enter the emergency service to the original wake-up sequence which is multiplied by D.
Further, setting all time slots to have a first time interval and a second time interval; the first time interval lengths of all time slots are the same, and the second time interval lengths are also the same; in normal service, the method further comprises: and in the first time interval, carrying out wake-up signal interception, and in the second time interval, transmitting the data information to the directly-belonging parent node of the previous layer.
Further, in a first time interval, 1 bit of information is extracted from the obtained wake-up signal according to each D bit to restore the m-sequence; when emergency service occurs, the triggering all the sensor nodes to enter an emergency working state includes: an m-sequence by reduction; and triggering the sensor node in the normal communication state to enter an emergency communication state.
Further, the method further comprises: and when more than two emergency services appear, processing the emergency services according to time.
Further, when the emergency service processing is completed, the method further includes: the central management node broadcasts and sends a releasing instruction of the emergency service to all sensor nodes in the WBAN; normal traffic is resumed according to the slot allocation.
On the other hand, the invention also provides a system for processing the WBAN service of the wireless body area network, wherein all the sensor nodes and the central management node in the WBAN are networked according to the binary tree, and the central management node is set as the top point of the binary tree network; the method comprises the following steps: a central management node and at least two sensor nodes; wherein,
the central management node comprises: a time slot distribution unit and an emergency operator unit; wherein,
the time slot allocation unit is used for allocating corresponding time slots for the sensor nodes according to the network distribution of the binary tree networking; the sensor nodes of the emergency service and the father nodes of all the upper layers of the sensor nodes directly belong to the sensor nodes seize the time slots from the beginning of the current time slot to the completion of the emergency service in sequence from low to high according to the network layer;
the emergency service unit is used for processing the emergency service of the sensor node generating the emergency service according to the time slot occupied by the time slot allocation unit when the emergency service occurs;
the sensor node is used for broadcasting a wake-up signal to all sensor nodes in the network when the emergency service occurs; all sensor nodes in the WBAN enter an emergency communication state after receiving the wake-up signal, and the sensor nodes in the normal communication state give up the current time slot.
Further, the central management node further includes a normal service unit, which is configured to set the sensor node and its parent node directly belonging to the previous layer that acquire the current time slot to enter a normal communication state, and the other sensor nodes to enter a quasi-sleep state, when the emergency service does not occur.
Further, allocating a corresponding time slot to each sensor node according to the network distribution of the binary tree networking comprises:
according to the network distribution of the binary tree networking of the sensor nodes, carrying out time slot allocation from small to large according to the network number;
allocating unit time slots for bottom sensor nodes; each father node allocates a time slot of which the total number of all nodes under the father node is added with 1.
Furthermore, the central management node also comprises a quasi-sleep state unit which is used for setting the working frequency of the sensor node which is not in the normal communication state to be 1/D when in the normal communication state; wherein D is equal to 8 or 16.
Further, the sensor node comprises a wake-up signal unit for repeating each bit of information in the m-sequence for waking up the normal operating state to enter the emergency service by D times to generate a wake-up signal for triggering the node in the quasi-sleep state to enter the emergency communication state.
Further, the central management node further comprises an interval setting unit, configured to set that all the time slots have a first time interval and a second time interval; the first time interval lengths of all time slots are the same, and the second time interval lengths are also the same; in normal service, the method further comprises: and receiving the wake-up signal in a first time interval, and transmitting data information to the directly-belonging parent node of the upper layer in a second time interval.
Further, in the first time interval, when an emergency service occurs, the sensor node further includes a sequence extraction unit, configured to extract 1-bit information per D-bit for the obtained wake-up signal to restore an m-sequence; and when emergency service occurs, triggering the sensor node in the normal communication state to enter the emergency communication state through the restored m-sequence.
Further, the central management node further includes an emergency service coordination unit, configured to coordinate and process emergency services according to time when more than two emergency services occur.
Furthermore, the central management node also comprises an emergency service release unit, which is used for broadcasting and sending an emergency service release instruction to all sensor nodes in the WBAN when the emergency service is processed; and performing service processing according to the normal service processing unit.
The technical scheme includes that binary tree networking is conducted on all sensor nodes and central management nodes of the WBAN, and the central management nodes are the top points of the network; further comprising: allocating corresponding time slots for each sensor node according to the network distribution of the binary tree networking; when an emergency service occurs, the sensor node which generates the emergency service broadcasts a wake-up signal to trigger all sensor nodes in the WBAN to enter an emergency communication state, and the sensor node in a normal communication state gives up the current time slot; and the sensor nodes of the emergency service and the father nodes of all the upper layers of the sensor nodes of the emergency service directly belong to seize the time slots from the beginning of the current time slot to the completion of the emergency service in sequence from low to high according to the network layer, and the emergency service is processed. The invention carries out time slot distribution on the nodes of the WBAN according to the binary tree network hierarchy, thereby realizing that all the nodes are triggered to enter an emergency communication state through the wake-up signal; and the node of the emergency service and the directly-subordinate father node thereof seize the time slot from the beginning of the current time slot to the completion of the emergency service, and carry out emergency service processing.
On the other hand, through the quasi-sleep mode, the sensor node which is not in the normal communication state works according to the 1/D frequency in the normal communication state, so that the energy consumption of the sensor node is reduced while the monitoring of the wake-up signal is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a method of implementing wireless body area network service processing of the present invention;
FIG. 2 is a diagram of an exemplary wireless body area network human body application of the present invention;
FIG. 3 is a schematic diagram of a four-tier network structure distribution for binary tree networking in accordance with the present invention;
fig. 4 is a schematic diagram of the delay performance for implementing emergency service processing according to the present invention;
FIG. 5 is a diagram illustrating the latency performance of normal business processing according to the present invention;
FIG. 6 is a schematic diagram of the present invention for achieving full network energy consumption performance;
fig. 7 is a block diagram of a system for implementing service processing of a wireless body area network according to the present invention.
Detailed Description
Fig. 1 is a flowchart of a method for implementing a service processing of a wireless body area network, as shown in fig. 1, all sensor nodes and a central management node of a WBAN are subjected to binary tree networking, and the central management node is a vertex of the network; the method comprises the following steps:
and step 100, distributing corresponding time slots for each sensor node according to the network distribution of the binary tree networking.
In this step, the allocating corresponding time slots to each sensor node according to the network distribution of the binary tree networking includes: according to the network distribution of the binary tree networking of the sensor nodes, carrying out time slot allocation from small to large according to the network number; allocating unit time slots for bottom sensor nodes; each father node allocates a time slot of which the total number of all nodes under the father node is added with 1.
It should be noted that, the allocation of the time slot to the sensor node is implemented by the central management node, and certainly, after the network composition is determined, the time slot may also be actively acquired by the sensor node according to the network position of the binary tree networking, and the allocation of the time slot by the central management node is common knowledge and will not be described herein again.
Fig. 2 is a schematic diagram of an example of a human body application of a wireless body area network according to the present invention, as shown in fig. 2, a five-pointed star at a central position is a central management node, and a dotted line is used as an extended connection line of a binary tree neural network, so that the general distribution of sensor nodes attached to a human body can be seen.
Fig. 3 is a schematic diagram of a four-layer network structure distribution of the binary tree network networking of the present invention, as shown in the figure, according to the function of the binary tree network, after the networking is completed, 8 sensor nodes are provided at the bottom layer of the four-layer network, where the reference numbers 9, 10, 11, and 12 are respectively father nodes corresponding to 1-2, 3-4, 5-6, and 7-8, 13 is a father node of 1-4, 9, and 10, and 14 is a father node of 5-8, 11, and 12, respectively; therefore, the bottom sensor node allocates unit time slots, namely 1-8 allocates 1-8 th time slots respectively; each father node allocates a time slot of which the total number of all nodes under the father node is added with 1, namely 9, 10, 11 and 12 allocate 3 time slots respectively; 13. and 14 are allocated 7 slots, respectively.
It should be noted that the time slot is actually a time concept, which is equivalent to the time allocated to the sensor node to perform the respective service processing; the binary tree neural network is numbered according to the fixed mode, time slot distribution is carried out according to the number, and in addition, each layer of the binary tree network is determined according to the communication strength of the communication link.
Step 101, when an emergency service occurs, the sensor node which has the emergency service broadcasts a wake-up signal to trigger all the sensor nodes in the WBAN to enter an emergency communication state, and the sensor node in the normal communication state abandons the current time slot.
In this step, the quasi-sleep state is: the operating frequency is 1/D of the state in the normal communication state, wherein D is equal to 8 or 16.
The wake-up signal is: and repeating each bit of information in the m-sequence for waking up the normal working state to enter the emergency service to the original wake-up sequence which is multiplied by D.
It should be noted that, because the operating frequency of the quasi-sleep state is 1/D of that in the normal communication state, in the prior art, each bit of information needs to be repeated to D times of the original information for the m-sequence from the sleep state to the operating state, so that in the original period, if an emergency service occurs, the wake-up signal can be discovered by the sensor node in the quasi-sleep state.
In addition, the m-sequence for waking up the normal working state to enter the emergency service means that in the prior art, when all the nodes are in the normal working state, the m-sequence can trigger the sensor node in the normal communication state to the emergency communication state.
And 102, sequentially preempting time slots from the current time slot to the time slot when the emergency service is completed according to the network layer from low to high by the sensor node of the emergency service and the father node of each upper layer of the sensor node of the emergency service, and processing the emergency service.
Still, step 102 is explained by referring to fig. 2, and it is assumed that an emergency service occurs in the sensor node No. 1 in the figure, and the acquired medical data information includes a vital sign information that seriously exceeds the implementation set safety range, at this time, the sensor nodes No. 1, No. 9, and No. 13 seize the connected 3 time slots from the current time slot in sequence, and the application transmits the emergency service.
The method of the invention also comprises the following steps: and during normal service, the sensor node acquiring the current time slot and the parent node of the upper layer directly belonging to the sensor node enter a normal communication state, and other sensor nodes enter a quasi-sleep state.
In the step, all time slots are set to have a first time interval and a second time interval; the first time interval lengths of all time slots are the same, and the second time interval lengths are also the same; in normal service, the method of the present invention further comprises: and in the first time interval, carrying out wake-up signal interception, and in the second time interval, transmitting the data information to the directly-belonging parent node of the previous layer.
Further, in a first time interval, 1 bit of information is extracted from the obtained wake-up signal according to each D bit to restore the m-sequence; when emergency service occurs, the triggering all the sensor nodes to enter an emergency working state includes: an m-sequence by reduction; and triggering the sensor node in the normal communication state to enter an emergency communication state.
The method of the invention also comprises the following steps: and when more than two emergency services appear, processing the emergency services according to time.
The method of the invention also comprises the following steps: when the emergency service processing is completed, the method of the invention further comprises: the central management node broadcasts and sends a releasing instruction of the emergency service to all sensor nodes in the WBAN; normal traffic is resumed according to the slot allocation.
In the above embodiments, the setting of the first and second time intervals, the processing of the emergency service and the normal service, and the like are all realized by the central management node.
By means of simulation, performance comparison is performed on emergency service processing, normal service processing and Strict Sleep-Unsupported time slot Preemption (SS-PU) and Full-time work-Supported time slot Preemption (Full-Active-Preemption-Supported FA-PS) in time delay and power consumption.
Fig. 4 is a schematic diagram of the time delay performance for realizing emergency service processing according to the present invention, and as shown in fig. 4, data simulation is performed according to the emergency service occurring at the lowest sensor node, so as to realize comparison of the performance of the SS-PU and FA-PS after the emergency service processing is completed and the performance of the present invention, where the black percentage column is the time delay of the SS-PU, and the colorless percentage column and the right oblique line percentage column are the time delay of the FA-PS and the time delay of the recovery to the emergency service processing in the quasi-sleep mode of the present invention. It can be analyzed from fig. 4 that the time delay of the invention is basically equivalent to the sensor node network working in the whole time period, and the energy consumption of the sensor node working in the whole time period is certainly about D-1 times higher than that of the invention theoretically.
Fig. 5 is a schematic diagram of the delay performance for realizing normal service processing according to the present invention, and as shown in fig. 5, data simulation is performed according to normal service processing performed from the lowest layer number 1 sensor node to realize comparison of the performance of the normal service processing completed SS-PU and FA-PS and the present invention, where the black percentage column is the delay of the SS-PU, and the colorless percentage column and the right oblique line percentage column are the delay of the FA-PS and the delay of the recovery to emergency service processing in the quasi sleep mode of the present invention. From the comparison schematic diagram, it can be obtained that the time delay of the method of the invention is between the two under the normal working state.
Fig. 6 is a schematic diagram of the implementation of the energy consumption performance of the whole network according to the present invention, and as shown in fig. 6, the effect simulation including normal service processing and emergency service processing is performed once according to the normal service processing performed from the lowest layer number 1 sensor node and the emergency service generated by the number 1 node. The energy consumption comparison of SS-PU and FA-PS which comprise two types of service processing and the invention is realized, wherein the black percentage column is the time delay of the SS-PU, the colorless percentage column and the right oblique line percentage column are the time delay of the FA-PS and the invention recovers to the emergency service processing under the quasi-sleep mode. The comparison schematic diagram shows that the energy consumption of the method is equivalent to that of the whole network in the strict sleep mode.
By combining the data, the sensor node network working in the time delay and the whole time period of the emergency service is superior to a strict sleep mode; the energy consumption performance of the whole network is equivalent to that of the whole network operation in a strict sleep mode. Therefore, the method realizes the time delay and energy consumption, and improves the WBAN application more mature.
Fig. 7 is a block diagram of a system for implementing service processing of a wireless body area network according to the present invention, and as shown in fig. 7, all sensor nodes and central management nodes in a WBAN are networked according to a binary tree, and the central management node is set as a vertex of the binary tree network; the method comprises the following steps: a central management node and at least two sensor nodes; wherein,
the central management node comprises: a time slot distribution unit and an emergency operator unit; wherein,
the time slot allocation unit is used for allocating corresponding time slots for the sensor nodes according to the network distribution of the binary tree networking; and the sensor nodes of the emergency service and the father nodes of all the upper layers of the sensor nodes directly belong to the sensor nodes seize the time slots from the beginning of the current time slot to the completion of the emergency service in sequence from low to high according to the network layer.
Allocating corresponding time slots for each sensor node according to the network distribution of the binary tree networking comprises the following steps:
according to the network distribution of the binary tree networking of the sensor nodes, carrying out time slot allocation from small to large according to the network number;
allocating unit time slots for bottom sensor nodes; each father node allocates a time slot of which the total number of all nodes under the father node is added with 1.
The sensor node is used for broadcasting a wake-up signal to all sensor nodes in the network when the emergency service occurs; all sensor nodes in the WBAN enter an emergency communication state after receiving the wake-up signal, and the sensor nodes in the normal communication state give up the current time slot.
And the emergency service unit is used for processing the emergency service of the sensor node generating the emergency service according to the time slot preempted by the time slot allocation unit when the emergency service occurs.
The central management node also comprises a normal service unit which is used for setting the sensor node which obtains the current time slot and the father node of the upper layer directly belonging to the sensor node to enter a normal communication state and setting other sensor nodes to enter a quasi-sleep state when the emergency service does not occur.
The central management node also comprises an interval setting unit which is used for setting that all time slots have a first time interval and a second time interval; the first time interval lengths of all time slots are the same, and the second time interval lengths are also the same; in normal service, the method further comprises: and receiving the wake-up signal in a first time interval, and transmitting data information to the directly-belonging parent node of the upper layer in a second time interval.
In a first time interval, when an emergency service occurs, the sensor node further comprises a sequence extraction unit, wherein the sequence extraction unit is used for extracting 1 bit of information from the obtained wake-up signal according to every D bit so as to restore the m-sequence; and when emergency service occurs, triggering the sensor node in the normal communication state to enter the emergency communication state through the restored m-sequence.
It should be noted that, the sequence extraction unit, which is generally implemented in a software manner, is a command similar to a trigger type, and the same content is set in each sensor node, so as to trigger the sensor node to perform corresponding work when a trigger condition is met.
The central management node also comprises a quasi-sleep state unit which is used for setting the working frequency of the sensor node which is not in the normal communication state to be 1/D when in the normal communication state; wherein D is equal to 8 or 16.
The sensor node comprises a wake-up signal unit for repeating each bit of information in the m-sequence for waking up the normal working state to enter the emergency service to D times of the original information to generate a wake-up signal for triggering the node in the quasi-sleep state to enter the emergency communication state.
The central management node also comprises an emergency service coordination unit which is used for coordinating and processing the emergency services according to time when more than two emergency services appear.
The central management node also comprises an emergency service relieving unit, and is used for generating and broadcasting an emergency service relieving instruction to all sensor nodes in the WBAN when the emergency service is processed; and performing service processing according to the normal service processing unit.
The above description is only a preferred example of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A method for processing WBAN service in wireless body area network is characterized in that all sensor nodes and central management nodes of WBAN are networked in binary tree, and the central management nodes are the top points of the network; the method comprises the following steps:
allocating corresponding time slots for each sensor node according to the network distribution of the binary tree networking;
during normal service, the sensor node which acquires the current time slot and the father node which directly belongs to the upper layer enter a normal communication state, and other sensor nodes enter a quasi-sleep state; wherein the quasi-sleep state is: the working frequency is 1/D state in the normal communication state, wherein D is equal to 8 or 16;
when an emergency service occurs, the sensor node which generates the emergency service broadcasts a wake-up signal to trigger all sensor nodes in the WBAN to enter an emergency communication state, and the sensor node in a normal communication state gives up the current time slot; wherein the wake-up signal is: repeating each bit of information in the m-sequence for waking up the normal working state to enter the emergency service to an original wake-up sequence which is D times;
and the sensor nodes of the emergency service and the father nodes of all the upper layers of the sensor nodes of the emergency service directly belong to seize the time slots from the beginning of the current time slot to the completion of the emergency service in sequence from low to high according to the network layer, and the emergency service is processed.
2. The method of claim 1, wherein the allocating respective time slots for each sensor node according to the network distribution of the binary tree network comprises:
according to the network distribution of the binary tree networking of the sensor nodes, carrying out time slot allocation from small to large according to the network number;
allocating unit time slots for bottom sensor nodes; each father node allocates a time slot of which the total number of all nodes under the father node is added with 1.
3. The method of claim 1, wherein all slots are set to have a first time interval and a second time interval; the first time interval lengths of all time slots are the same, and the second time interval lengths are also the same; in normal service, the method further comprises: and in the first time interval, carrying out wake-up signal interception, and in the second time interval, transmitting the data information to the directly-belonging parent node of the previous layer.
4. The method according to claim 3, wherein in the first time interval, 1 bit of information is extracted for each D bit of the obtained wake-up signal to restore an m-sequence; when emergency service occurs, the triggering all the sensor nodes to enter an emergency working state includes: an m-sequence by reduction; and triggering the sensor node in the normal communication state to enter an emergency communication state.
5. The method of claim 1, further comprising: and when more than two emergency services appear, processing the emergency services according to time.
6. The method of claim 1, wherein upon completion of the emergency service treatment, the method further comprises: the central management node broadcasts and sends a releasing instruction of the emergency service to all sensor nodes in the WBAN; normal traffic is resumed according to the slot allocation.
7. A system for processing WBAN service in wireless body area network is characterized in that all sensor nodes and central management nodes in WBAN are networked according to a binary tree, and the central management nodes are set as the top points of the binary tree network; the method comprises the following steps: a central management node and at least two sensor nodes; wherein,
the central management node comprises: the system comprises a time slot allocation unit, a normal service unit, a quasi-sleep state unit and an emergency service unit;
the time slot allocation unit is used for allocating corresponding time slots for the sensor nodes according to the network distribution of the binary tree networking; the sensor nodes of the emergency service and the father nodes of all the upper layers of the sensor nodes directly belong to the sensor nodes seize the time slots from the beginning of the current time slot to the completion of the emergency service in sequence from low to high according to the network layer;
the normal service unit is used for setting the sensor node which obtains the current time slot and the parent node which directly belongs to the upper layer to enter a normal communication state and setting other sensor nodes to enter a quasi-sleep state when the emergency service does not occur;
the quasi-sleep state unit is used for setting the working frequency of the sensor node which is not in the normal communication state to be 1/D when in the normal communication state; wherein D is equal to 8 or 16;
the emergency service unit is used for processing the emergency service of the sensor node generating the emergency service according to the time slot occupied by the time slot allocation unit when the emergency service occurs;
the sensor node is used for broadcasting a wake-up signal to all sensor nodes in the network when the emergency service occurs; all sensor nodes in the WBAN enter an emergency communication state after receiving the wake-up signal, and the sensor nodes in the normal communication state give up the current time slot;
the sensor node comprises a wake-up signal unit, and the wake-up signal unit is used for repeating each bit of information in the m-sequence for waking up the normal working state to enter the emergency service to D times of the original information so as to generate a wake-up signal for triggering the node in the quasi-sleep state to enter the emergency communication state.
8. The system of claim 7, wherein the allocating respective time slots for each sensor node according to the network distribution of the binary tree network comprises:
according to the network distribution of the binary tree networking of the sensor nodes, carrying out time slot allocation from small to large according to the network number;
allocating unit time slots for bottom sensor nodes; each father node allocates a time slot of which the total number of all nodes under the father node is added with 1.
9. The system according to claim 7, wherein the central management node further comprises an interval setting unit for setting all the slots to have a first time interval and a second time interval; the first time interval lengths of all time slots are the same, and the second time interval lengths are also the same; and during normal service, receiving the wake-up signal in a first time interval, and transmitting data information to the directly-belonging parent node of the previous layer in a second time interval.
10. The system according to claim 9, wherein the sensor node further comprises a sequence extraction unit for extracting 1-bit information per D-bit of the obtained wake-up signal to restore an m-sequence when an emergency service occurs during the first time interval; and when emergency service occurs, triggering the sensor node in the normal communication state to enter the emergency communication state through the restored m-sequence.
11. The system according to claim 7, wherein the central management node further comprises an emergency service coordination unit, configured to coordinate processing of emergency services according to time sequence when more than two emergency services occur.
12. The system of claim 7, wherein the central management node further comprises an emergency service release unit, for broadcasting an emergency service release command to all sensor nodes in the WBAN when the emergency service is processed; and performing service processing according to the normal service processing unit.
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| CN110167115A (en) * | 2019-05-20 | 2019-08-23 | 河南科技大学 | Wireless body area network MAC protocol, communication means and system based on wake-up mechanism |
| CN115103454B (en) * | 2022-06-23 | 2024-05-24 | 重庆邮电大学 | Burst emergency data stream time slot preemption method for 6TiSCH network |
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| CN102497620A (en) * | 2011-12-01 | 2012-06-13 | 华为技术有限公司 | Method and system of information transmission in wireless sensor network |
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| EP2227046B1 (en) * | 2009-03-04 | 2015-07-29 | Fujitsu Limited | Improvements to body area networks |
| FR2965061A1 (en) * | 2010-09-16 | 2012-03-23 | Commissariat Energie Atomique | METHOD AND SYSTEM FOR OPERATING INDIRECT PATHS OF UWB-TYPE SIGNALS TO LOCATE A WIRELESS COMMUNICATION NODE INCLUDED BY A BODY |
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| CN102497620A (en) * | 2011-12-01 | 2012-06-13 | 华为技术有限公司 | Method and system of information transmission in wireless sensor network |
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